This Age that lasted through the 3rd and 4th Centuries AH/9th and 10th Centuries AD can, in fact, be referred to as the period of renaissance in the culture of the Islamic Iran. This Age witnessed the fruits of the dynamic effort of the first two centuries and paved the way for the emergence of a new cultural life in the history of Iran. Iran freed itself from the dominance of the Baghdad caliphate while the oral and theoretical sciences that had been inherited from the culture and learning of the Sassanid period alongside a major trend marking the translation of Greek philosophical works gained authority and prominence. It was during this period that the study of theology witnessed growth and glory throughout an independent Iran. The most significant feature of this age was the freedom of thought and intellectual tolerance that had surfaced in the country, thereby marking the emergence of a number of schools of thought in the field of theology.